import java.util.Random;

public class RandomNums {
    public static void main(String[] args) {
        StringBuilder builder = new StringBuilder();
        Random random = new Random();
        for (int i = 0; i < 20; i++) {
            int temp = random.nextInt(500);
            builder.append(temp+" ");
        }
        System.out.println(builder);

        char a = 'a';
        System.out.println((a+'b'));
    }
}
